154761221731 has 2 divisors, whose sum is σ = 154761221732. Its totient is φ = 154761221730.

The previous prime is 154761221729. The next prime is 154761221767. The reversal of 154761221731 is 137122167451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 154761221731 - 2¹ = 154761221729 is a prime.

It is a super-2 number, since 2×154761221731² (a number of 23 digits) contains 22 as substring.

Together with 154761221729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (154761221711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77380610865 + 77380610866.

It is an arithmetic number, because the mean of its divisors is an integer number (77380610866).

Almost surely, 2^154761221731 is an apocalyptic number.

154761221731 is a deficient number, since it is larger than the sum of its proper divisors (1).

154761221731 is an equidigital number, since it uses as much as digits as its factorization.

154761221731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 40.

The spelling of 154761221731 in words is "one hundred fifty-four billion, seven hundred sixty-one million, two hundred twenty-one thousand, seven hundred thirty-one".