375451721 has 2 divisors, whose sum is σ = 375451722. Its totient is φ = 375451720.

The previous prime is 375451717. The next prime is 375451733. The reversal of 375451721 is 127154573.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280194121 + 95257600 = 16739^2 + 9760^2 .

It is a cyclic number.

It is not a de Polignac number, because 375451721 - 2² = 375451717 is a prime.

It is equal to p_20094686 and since 375451721 and 20094686 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (375451711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 187725860 + 187725861.

It is an arithmetic number, because the mean of its divisors is an integer number (187725861).

Almost surely, 2^375451721 is an apocalyptic number.

It is an amenable number.

375451721 is a deficient number, since it is larger than the sum of its proper divisors (1).

375451721 is an equidigital number, since it uses as much as digits as its factorization.

375451721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29400, while the sum is 35.

The square root of 375451721 is about 19376.5766068209. The cubic root of 375451721 is about 721.4142220420.

The spelling of 375451721 in words is "three hundred seventy-five million, four hundred fifty-one thousand, seven hundred twenty-one".