1631457 has 6 divisors (see below), whose sum is σ = 2356562. Its totient is φ = 1087632.

The previous prime is 1631447. The next prime is 1631471. The reversal of 1631457 is 7541361.

It can be written as a sum of positive squares in only one way, i.e., 1147041 + 484416 = 1071^2 + 696^2 .

It is not a de Polignac number, because 1631457 - 2¹¹ = 1629409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1631457.

It is not an unprimeable number, because it can be changed into a prime (1631407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90628 + ... + 90645.

2^1631457 is an apocalyptic number.

It is an amenable number.

1631457 is a deficient number, since it is larger than the sum of its proper divisors (725105).

1631457 is a wasteful number, since it uses less digits than its factorization.

1631457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181279 (or 181276 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 1631457 is about 1277.2850112641. The cubic root of 1631457 is about 117.7222472358.

The spelling of 1631457 in words is "one million, six hundred thirty-one thousand, four hundred fifty-seven".