1631961 has 8 divisors (see below), whose sum is σ = 2417760. Its totient is φ = 1087956.

The previous prime is 1631957. The next prime is 1631969. The reversal of 1631961 is 1691361.

It is not a de Polignac number, because 1631961 - 2² = 1631957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 60443 = 1631961 / (1 + 6 + 3 + 1 + 9 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (1631969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30195 + ... + 30248.

It is an arithmetic number, because the mean of its divisors is an integer number (302220).

2^1631961 is an apocalyptic number.

It is an amenable number.

1631961 is a deficient number, since it is larger than the sum of its proper divisors (785799).

1631961 is an equidigital number, since it uses as much as digits as its factorization.

1631961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60452 (or 60446 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1631961 is about 1277.4822895054. The cubic root of 1631961 is about 117.7343684877.

The spelling of 1631961 in words is "one million, six hundred thirty-one thousand, nine hundred sixty-one".