1550977157 has 2 divisors, whose sum is σ = 1550977158. Its totient is φ = 1550977156.

The previous prime is 1550977121. The next prime is 1550977187. The reversal of 1550977157 is 7517790551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1416092161 + 134884996 = 37631^2 + 11614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550977157 - 2¹⁴ = 1550960773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550977117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775488578 + 775488579.

It is an arithmetic number, because the mean of its divisors is an integer number (775488579).

Almost surely, 2^1550977157 is an apocalyptic number.

It is an amenable number.

1550977157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550977157 is an equidigital number, since it uses as much as digits as its factorization.

1550977157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 385875, while the sum is 47.

The square root of 1550977157 is about 39382.4473211099. The cubic root of 1550977157 is about 1157.5376715407.

The spelling of 1550977157 in words is "one billion, five hundred fifty million, nine hundred seventy-seven thousand, one hundred fifty-seven".