77001131231 has 2 divisors, whose sum is σ = 77001131232. Its totient is φ = 77001131230.

The previous prime is 77001131201. The next prime is 77001131239. The reversal of 77001131231 is 13213110077.

It is a strong prime.

It is an emirp because it is prime and its reverse (13213110077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77001131231 - 2¹⁰ = 77001130207 is a prime.

It is a super-2 number, since 2×77001131231² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77001131231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77001131239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38500565615 + 38500565616.

It is an arithmetic number, because the mean of its divisors is an integer number (38500565616).

Almost surely, 2^77001131231 is an apocalyptic number.

77001131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77001131231 is an equidigital number, since it uses as much as digits as its factorization.

77001131231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882, while the sum is 26.

The spelling of 77001131231 in words is "seventy-seven billion, one million, one hundred thirty-one thousand, two hundred thirty-one".