151026721 has 2 divisors, whose sum is σ = 151026722. Its totient is φ = 151026720.

The previous prime is 151026713. The next prime is 151026731. The reversal of 151026721 is 127620151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147282496 + 3744225 = 12136^2 + 1935^2 .

It is an emirp because it is prime and its reverse (127620151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 151026721 - 2³ = 151026713 is a prime.

It is not a weakly prime, because it can be changed into another prime (151026731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75513360 + 75513361.

It is an arithmetic number, because the mean of its divisors is an integer number (75513361).

Almost surely, 2^151026721 is an apocalyptic number.

It is an amenable number.

151026721 is a deficient number, since it is larger than the sum of its proper divisors (1).

151026721 is an equidigital number, since it uses as much as digits as its factorization.

151026721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 151026721 is about 12289.2929414186. The cubic root of 151026721 is about 532.5388111925.

Adding to 151026721 its reverse (127620151), we get a palindrome (278646872).

The spelling of 151026721 in words is "one hundred fifty-one million, twenty-six thousand, seven hundred twenty-one".