171620051 has 2 divisors, whose sum is σ = 171620052. Its totient is φ = 171620050.

The previous prime is 171620041. The next prime is 171620101. The reversal of 171620051 is 150026171.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171620051 - 2¹⁰ = 171619027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 171619999 and 171620026.

It is not a weakly prime, because it can be changed into another prime (171620041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85810025 + 85810026.

It is an arithmetic number, because the mean of its divisors is an integer number (85810026).

Almost surely, 2^171620051 is an apocalyptic number.

171620051 is a deficient number, since it is larger than the sum of its proper divisors (1).

171620051 is an equidigital number, since it uses as much as digits as its factorization.

171620051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 171620051 is about 13100.3836203372. The cubic root of 171620051 is about 555.7199767838.

The spelling of 171620051 in words is "one hundred seventy-one million, six hundred twenty thousand, fifty-one".