1251325161251 has 4 divisors (see below), whose sum is σ = 1365081994104. Its totient is φ = 1137568328400.

The previous prime is 1251325161227. The next prime is 1251325161269. The reversal of 1251325161251 is 1521615231521.

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

It is a cyclic number.

It is not a de Polignac number, because 1251325161251 - 2²² = 1251320966947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251325121251) 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, 56878416410 + ... + 56878416431.

It is an arithmetic number, because the mean of its divisors is an integer number (341270498526).

Almost surely, 2^{1251325161251} is an apocalyptic number.

1251325161251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1251325161251 is a deficient number, since it is larger than the sum of its proper divisors (113756832853).

1251325161251 is a wasteful number, since it uses less digits than its factorization.

1251325161251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113756832852.

The product of its digits is 18000, while the sum is 35.

The spelling of 1251325161251 in words is "one trillion, two hundred fifty-one billion, three hundred twenty-five million, one hundred sixty-one thousand, two hundred fifty-one".