993405131 has 2 divisors, whose sum is σ = 993405132. Its totient is φ = 993405130.

The previous prime is 993405109. The next prime is 993405143. The reversal of 993405131 is 131504399.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 993405131 - 2¹⁸ = 993142987 is a prime.

It is a super-2 number, since 2×993405131² = 1973707508594254322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 993405091 and 993405100.

It is not a weakly prime, because it can be changed into another prime (993405431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496702565 + 496702566.

It is an arithmetic number, because the mean of its divisors is an integer number (496702566).

Almost surely, 2^993405131 is an apocalyptic number.

993405131 is a deficient number, since it is larger than the sum of its proper divisors (1).

993405131 is an equidigital number, since it uses as much as digits as its factorization.

993405131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 993405131 is about 31518.3300794950. The cubic root of 993405131 is about 997.7968600723.

The spelling of 993405131 in words is "nine hundred ninety-three million, four hundred five thousand, one hundred thirty-one".