610991947 has 2 divisors, whose sum is σ = 610991948. Its totient is φ = 610991946.

The previous prime is 610991929. The next prime is 610991957. The reversal of 610991947 is 749199016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 610991947 - 2⁷ = 610991819 is a prime.

It is a super-2 number, since 2×610991947² = 746622318597701618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 610991897 and 610991906.

It is not a weakly prime, because it can be changed into another prime (610991957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305495973 + 305495974.

It is an arithmetic number, because the mean of its divisors is an integer number (305495974).

Almost surely, 2^610991947 is an apocalyptic number.

610991947 is a deficient number, since it is larger than the sum of its proper divisors (1).

610991947 is an equidigital number, since it uses as much as digits as its factorization.

610991947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 610991947 is about 24718.2512933257. The cubic root of 610991947 is about 848.5520664041.

The spelling of 610991947 in words is "six hundred ten million, nine hundred ninety-one thousand, nine hundred forty-seven".