161252590 has 16 divisors (see below), whose sum is σ = 297334800. Its totient is φ = 62927680.

The previous prime is 161252587. The next prime is 161252591. The reversal of 161252590 is 95252161.

161252590 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161252591) 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, 196240 + ... + 197059.

It is an arithmetic number, because the mean of its divisors is an integer number (18583425).

Almost surely, 2^161252590 is an apocalyptic number.

161252590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161252590 is a deficient number, since it is larger than the sum of its proper divisors (136082210).

161252590 is a wasteful number, since it uses less digits than its factorization.

161252590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393347.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 161252590 is about 12698.5270799412. The cubic root of 161252590 is about 544.2965308617.

The spelling of 161252590 in words is "one hundred sixty-one million, two hundred fifty-two thousand, five hundred ninety".