1657234949 has 2 divisors, whose sum is σ = 1657234950. Its totient is φ = 1657234948.

The previous prime is 1657234937. The next prime is 1657234979. The reversal of 1657234949 is 9494327561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1646898724 + 10336225 = 40582^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1657234949 - 2⁴ = 1657234933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1657234897 and 1657234906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1657234979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828617474 + 828617475.

It is an arithmetic number, because the mean of its divisors is an integer number (828617475).

Almost surely, 2^1657234949 is an apocalyptic number.

It is an amenable number.

1657234949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1657234949 is an equidigital number, since it uses as much as digits as its factorization.

1657234949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The square root of 1657234949 is about 40709.1506789321. The cubic root of 1657234949 is about 1183.3903618001.

The spelling of 1657234949 in words is "one billion, six hundred fifty-seven million, two hundred thirty-four thousand, nine hundred forty-nine".