155247431 has 2 divisors, whose sum is σ = 155247432. Its totient is φ = 155247430.

The previous prime is 155247427. The next prime is 155247437. The reversal of 155247431 is 134742551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155247431 - 2² = 155247427 is a prime.

It is a super-2 number, since 2×155247431² = 48203529664199522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155247437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77623715 + 77623716.

It is an arithmetic number, because the mean of its divisors is an integer number (77623716).

Almost surely, 2^155247431 is an apocalyptic number.

155247431 is a deficient number, since it is larger than the sum of its proper divisors (1).

155247431 is an equidigital number, since it uses as much as digits as its factorization.

155247431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

The square root of 155247431 is about 12459.8327035318. The cubic root of 155247431 is about 537.4542161111.

Adding to 155247431 its reverse (134742551), we get a palindrome (289989982).

The spelling of 155247431 in words is "one hundred fifty-five million, two hundred forty-seven thousand, four hundred thirty-one".