1251640083 has 16 divisors (see below), whose sum is σ = 1701334656. Its totient is φ = 818333760.

The previous prime is 1251640073. The next prime is 1251640099. The reversal of 1251640083 is 3800461521.

It is not a de Polignac number, because 1251640083 - 2⁵ = 1251640051 is a prime.

It is a super-3 number, since 3×1251640083³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1251640083.

It is not an unprimeable number, because it can be changed into a prime (1251640063) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15768 + ... + 52458.

It is an arithmetic number, because the mean of its divisors is an integer number (106333416).

Almost surely, 2^1251640083 is an apocalyptic number.

1251640083 is a deficient number, since it is larger than the sum of its proper divisors (449694573).

1251640083 is a wasteful number, since it uses less digits than its factorization.

1251640083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36914.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1251640083 is about 35378.5257324270. The cubic root of 1251640083 is about 1077.6882660107.

The spelling of 1251640083 in words is "one billion, two hundred fifty-one million, six hundred forty thousand, eighty-three".