1251940031 has 2 divisors, whose sum is σ = 1251940032. Its totient is φ = 1251940030.

The previous prime is 1251940013. The next prime is 1251940033. The reversal of 1251940031 is 1300491521.

Together with previous prime (1251940013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251940031 - 2²² = 1247745727 is a prime.

It is a super-2 number, since 2×1251940031² = 3134707682440561922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1251940033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251940033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625970015 + 625970016.

It is an arithmetic number, because the mean of its divisors is an integer number (625970016).

Almost surely, 2^1251940031 is an apocalyptic number.

1251940031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251940031 is an equidigital number, since it uses as much as digits as its factorization.

1251940031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1251940031 is about 35382.7646036881. The cubic root of 1251940031 is about 1077.7743463001.

The spelling of 1251940031 in words is "one billion, two hundred fifty-one million, nine hundred forty thousand, thirty-one".