1213773131 has 2 divisors, whose sum is σ = 1213773132. Its totient is φ = 1213773130.

The previous prime is 1213773079. The next prime is 1213773137. The reversal of 1213773131 is 1313773121.

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-1213773131 is a prime.

It is a super-2 number, since 2×1213773131² = 2946490427075086322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1213773094 and 1213773103.

It is not a weakly prime, because it can be changed into another prime (1213773137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606886565 + 606886566.

It is an arithmetic number, because the mean of its divisors is an integer number (606886566).

Almost surely, 2^1213773131 is an apocalyptic number.

1213773131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213773131 is an equidigital number, since it uses as much as digits as its factorization.

1213773131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 29.

The square root of 1213773131 is about 34839.2469924366. The cubic root of 1213773131 is about 1066.7087064269.

The spelling of 1213773131 in words is "one billion, two hundred thirteen million, seven hundred seventy-three thousand, one hundred thirty-one".