1551042431 has 4 divisors (see below), whose sum is σ = 1559163264. Its totient is φ = 1542921600.

The previous prime is 1551042401. The next prime is 1551042439. The reversal of 1551042431 is 1342401551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1342401551 = 37 ⋅36281123.

It is a cyclic number.

It is not a de Polignac number, because 1551042431 - 2¹⁴ = 1551026047 is a prime.

It is a super-2 number, since 2×1551042431² = 4811465245524779522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1551042431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551042439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4060130 + ... + 4060511.

It is an arithmetic number, because the mean of its divisors is an integer number (389790816).

Almost surely, 2^1551042431 is an apocalyptic number.

1551042431 is a deficient number, since it is larger than the sum of its proper divisors (8120833).

1551042431 is an equidigital number, since it uses as much as digits as its factorization.

1551042431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8120832.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1551042431 is about 39383.2760318387. The cubic root of 1551042431 is about 1157.5539099174.

Adding to 1551042431 its reverse (1342401551), we get a palindrome (2893443982).

The spelling of 1551042431 in words is "one billion, five hundred fifty-one million, forty-two thousand, four hundred thirty-one".