1542231251 has 4 divisors (see below), whose sum is σ = 1682434104. Its totient is φ = 1402028400.

The previous prime is 1542231233. The next prime is 1542231269. The reversal of 1542231251 is 1521322451.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1542231233) and next prime (1542231269).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1542231251 is a prime.

It is a super-2 number, since 2×1542231251² = 4756954463122050002, 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 1542231251.

It is not an unprimeable number, because it can be changed into a prime (1542237251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70101410 + ... + 70101431.

It is an arithmetic number, because the mean of its divisors is an integer number (420608526).

Almost surely, 2^1542231251 is an apocalyptic number.

1542231251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1542231251 is a deficient number, since it is larger than the sum of its proper divisors (140202853).

1542231251 is a wasteful number, since it uses less digits than its factorization.

1542231251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140202852.

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

The square root of 1542231251 is about 39271.2522209313. The cubic root of 1542231251 is about 1155.3577974846.

The spelling of 1542231251 in words is "one billion, five hundred forty-two million, two hundred thirty-one thousand, two hundred fifty-one".