155457761 has 2 divisors, whose sum is σ = 155457762. Its totient is φ = 155457760.

The previous prime is 155457749. The next prime is 155457767. The reversal of 155457761 is 167754551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153264400 + 2193361 = 12380^2 + 1481^2 .

It is an emirp because it is prime and its reverse (167754551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155457761 - 2⁶ = 155457697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155457767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77728880 + 77728881.

It is an arithmetic number, because the mean of its divisors is an integer number (77728881).

Almost surely, 2^155457761 is an apocalyptic number.

It is an amenable number.

155457761 is a deficient number, since it is larger than the sum of its proper divisors (1).

155457761 is an equidigital number, since it uses as much as digits as its factorization.

155457761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 41.

The square root of 155457761 is about 12468.2701687123. The cubic root of 155457761 is about 537.6968218076.

The spelling of 155457761 in words is "one hundred fifty-five million, four hundred fifty-seven thousand, seven hundred sixty-one".