1251057155 has 8 divisors (see below), whose sum is σ = 1507883472. Its totient is φ = 996435808.

The previous prime is 1251057127. The next prime is 1251057167. The reversal of 1251057155 is 5517501521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1251057155 - 2⁸ = 1251056899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549992 + ... + 552261.

It is an arithmetic number, because the mean of its divisors is an integer number (188485434).

Almost surely, 2^1251057155 is an apocalyptic number.

1251057155 is a deficient number, since it is larger than the sum of its proper divisors (256826317).

1251057155 is a wasteful number, since it uses less digits than its factorization.

1251057155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102485.

The product of its (nonzero) digits is 8750, while the sum is 32.

The square root of 1251057155 is about 35370.2863290644. The cubic root of 1251057155 is about 1077.5209356347.

Adding to 1251057155 its reverse (5517501521), we get a palindrome (6768558676).

The spelling of 1251057155 in words is "one billion, two hundred fifty-one million, fifty-seven thousand, one hundred fifty-five".