1551056417 has 4 divisors (see below), whose sum is σ = 1551155760. Its totient is φ = 1550957076.

The previous prime is 1551056411. The next prime is 1551056443. The reversal of 1551056417 is 7146501551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551056417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551056411) 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, 20567 + ... + 59372.

It is an arithmetic number, because the mean of its divisors is an integer number (387788940).

Almost surely, 2^1551056417 is an apocalyptic number.

It is an amenable number.

1551056417 is a deficient number, since it is larger than the sum of its proper divisors (99343).

1551056417 is an equidigital number, since it uses as much as digits as its factorization.

1551056417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99342.

The product of its (nonzero) digits is 21000, while the sum is 35.

The square root of 1551056417 is about 39383.4535941174. The cubic root of 1551056417 is about 1157.5573891904.

Adding to 1551056417 its reverse (7146501551), we get a palindrome (8697557968).

The spelling of 1551056417 in words is "one billion, five hundred fifty-one million, fifty-six thousand, four hundred seventeen".