155225761 has 2 divisors, whose sum is σ = 155225762. Its totient is φ = 155225760.

The previous prime is 155225753. The next prime is 155225803. The reversal of 155225761 is 167522551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153140625 + 2085136 = 12375^2 + 1444^2 .

It is a cyclic number.

It is not a de Polignac number, because 155225761 - 2³ = 155225753 is a prime.

It is not a weakly prime, because it can be changed into another prime (155235761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77612880 + 77612881.

It is an arithmetic number, because the mean of its divisors is an integer number (77612881).

Almost surely, 2^155225761 is an apocalyptic number.

It is an amenable number.

155225761 is a deficient number, since it is larger than the sum of its proper divisors (1).

155225761 is an equidigital number, since it uses as much as digits as its factorization.

155225761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 34.

The square root of 155225761 is about 12458.9630788441. The cubic root of 155225761 is about 537.4292083440.

The spelling of 155225761 in words is "one hundred fifty-five million, two hundred twenty-five thousand, seven hundred sixty-one".