1425611631991 has 2 divisors, whose sum is σ = 1425611631992. Its totient is φ = 1425611631990.

The previous prime is 1425611631931. The next prime is 1425611632037. The reversal of 1425611631991 is 1991361165241.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1425611631991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1425611631931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 712805815995 + 712805815996.

It is an arithmetic number, because the mean of its divisors is an integer number (712805815996).

Almost surely, 2^{1425611631991} is an apocalyptic number.

1425611631991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1425611631991 is an equidigital number, since it uses as much as digits as its factorization.

1425611631991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 49.

The spelling of 1425611631991 in words is "one trillion, four hundred twenty-five billion, six hundred eleven million, six hundred thirty-one thousand, nine hundred ninety-one".