1631061897 has 12 divisors (see below), whose sum is σ = 2295235440. Its totient is φ = 1030143672.

The previous prime is 1631061871. The next prime is 1631061899. The reversal of 1631061897 is 7981601361.

It is not a de Polignac number, because 1631061897 - 2⁶ = 1631061833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1631061899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 751947 + ... + 754112.

It is an arithmetic number, because the mean of its divisors is an integer number (191269620).

Almost surely, 2^1631061897 is an apocalyptic number.

It is an amenable number.

1631061897 is a deficient number, since it is larger than the sum of its proper divisors (664173543).

1631061897 is a wasteful number, since it uses less digits than its factorization.

1631061897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506100 (or 1506081 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1631061897 is about 40386.4073296945. The cubic root of 1631061897 is about 1177.1274322220.

The spelling of 1631061897 in words is "one billion, six hundred thirty-one million, sixty-one thousand, eight hundred ninety-seven".