1261054631 has 2 divisors, whose sum is σ = 1261054632. Its totient is φ = 1261054630.

The previous prime is 1261054591. The next prime is 1261054657. The reversal of 1261054631 is 1364501621.

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-1261054631 is a prime.

It is a super-2 number, since 2×1261054631² = 3180517564733092322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1261054594 and 1261054603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261054931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630527315 + 630527316.

It is an arithmetic number, because the mean of its divisors is an integer number (630527316).

Almost surely, 2^1261054631 is an apocalyptic number.

1261054631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261054631 is an equidigital number, since it uses as much as digits as its factorization.

1261054631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1261054631 is about 35511.3310226468. The cubic root of 1261054631 is about 1080.3835603222.

The spelling of 1261054631 in words is "one billion, two hundred sixty-one million, fifty-four thousand, six hundred thirty-one".