311629394 has 4 divisors (see below), whose sum is σ = 467444094. Its totient is φ = 155814696.

The previous prime is 311629349. The next prime is 311629399. The reversal of 311629394 is 493926113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493926113 = 8893 ⋅55541.

It can be written as a sum of positive squares in only one way, i.e., 248220025 + 63409369 = 15755^2 + 7963^2 .

It is a super-2 number, since 2×311629394² = 194225758409614472, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (311629399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77907347 + ... + 77907350.

Almost surely, 2^311629394 is an apocalyptic number.

311629394 is a deficient number, since it is larger than the sum of its proper divisors (155814700).

311629394 is a wasteful number, since it uses less digits than its factorization.

311629394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155814699.

The product of its digits is 34992, while the sum is 38.

The square root of 311629394 is about 17653.0278989186. The cubic root of 311629394 is about 677.9736344867.

The spelling of 311629394 in words is "three hundred eleven million, six hundred twenty-nine thousand, three hundred ninety-four".