1251342131 has 16 divisors (see below), whose sum is σ = 1358642208. Its totient is φ = 1145664000.

The previous prime is 1251342107. The next prime is 1251342133. The reversal of 1251342131 is 1312431521.

It is a de Polignac number, because none of the positive numbers 2^k-1251342131 is a prime.

It is a super-2 number, since 2×1251342131² = 3131714257631242322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1251342097 and 1251342106.

It is not an unprimeable number, because it can be changed into a prime (1251342133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 961181 + ... + 962481.

It is an arithmetic number, because the mean of its divisors is an integer number (84915138).

Almost surely, 2^1251342131 is an apocalyptic number.

1251342131 is a deficient number, since it is larger than the sum of its proper divisors (107300077).

1251342131 is a wasteful number, since it uses less digits than its factorization.

1251342131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862.

The product of its digits is 720, while the sum is 23.

The square root of 1251342131 is about 35374.3145657976. The cubic root of 1251342131 is about 1077.6027449249.

Adding to 1251342131 its reverse (1312431521), we get a palindrome (2563773652).

The spelling of 1251342131 in words is "one billion, two hundred fifty-one million, three hundred forty-two thousand, one hundred thirty-one".