1251612045 has 24 divisors (see below), whose sum is σ = 2263787136. Its totient is φ = 638503008.

The previous prime is 1251612031. The next prime is 1251612053. The reversal of 1251612045 is 5402161521.

1251612045 is a `hidden beast` number, since 1 + 2 + 5 + 1 + 612 + 0 + 45 = 666.

It is not a de Polignac number, because 1251612045 - 2⁷ = 1251611917 is a prime.

It is a super-2 number, since 2×1251612045² = 3133065422378164050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 603609 + ... + 605678.

It is an arithmetic number, because the mean of its divisors is an integer number (94324464).

Almost surely, 2^1251612045 is an apocalyptic number.

1251612045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251612045 is a deficient number, since it is larger than the sum of its proper divisors (1012175091).

1251612045 is a wasteful number, since it uses less digits than its factorization.

1251612045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209321 (or 1209318 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1251612045 is about 35378.1294728820. The cubic root of 1251612045 is about 1077.6802188493.

Adding to 1251612045 its reverse (5402161521), we get a palindrome (6653773566).

The spelling of 1251612045 in words is "one billion, two hundred fifty-one million, six hundred twelve thousand, forty-five".