1640941497 has 40 divisors (see below), whose sum is σ = 2655751560. Its totient is φ = 1009700640.

The previous prime is 1640941493. The next prime is 1640941537. The reversal of 1640941497 is 7941490461.

It can be written as a sum of positive squares in 4 ways, for example, as 182007081 + 1458934416 = 13491^2 + 38196^2 .

It is not a de Polignac number, because 1640941497 - 2² = 1640941493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640941493) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 173347 + ... + 182567.

It is an arithmetic number, because the mean of its divisors is an integer number (66393789).

Almost surely, 2^1640941497 is an apocalyptic number.

It is an amenable number.

1640941497 is a deficient number, since it is larger than the sum of its proper divisors (1014810063).

1640941497 is an frugal number, since it uses more digits than its factorization.

1640941497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9272 (or 9237 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1640941497 is about 40508.5361004320. The cubic root of 1640941497 is about 1179.4993320309.

The spelling of 1640941497 in words is "one billion, six hundred forty million, nine hundred forty-one thousand, four hundred ninety-seven".