1291547951 has 2 divisors, whose sum is σ = 1291547952. Its totient is φ = 1291547950.

The previous prime is 1291547899. The next prime is 1291547981. The reversal of 1291547951 is 1597451921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291547951 is a prime.

It is a super-2 number, since 2×1291547951² = 3336192219464596802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291547981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645773975 + 645773976.

It is an arithmetic number, because the mean of its divisors is an integer number (645773976).

Almost surely, 2^1291547951 is an apocalyptic number.

1291547951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291547951 is an equidigital number, since it uses as much as digits as its factorization.

1291547951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 44.

The square root of 1291547951 is about 35938.1127912972. The cubic root of 1291547951 is about 1089.0224805162.

The spelling of 1291547951 in words is "one billion, two hundred ninety-one million, five hundred forty-seven thousand, nine hundred fifty-one".