151401521 has 4 divisors (see below), whose sum is σ = 155493492. Its totient is φ = 147309552.

The previous prime is 151401499. The next prime is 151401553. The reversal of 151401521 is 125104151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73273600 + 78127921 = 8560^2 + 8839^2 .

It is a cyclic number.

It is not a de Polignac number, because 151401521 - 2²⁶ = 84292657 is a prime.

It is a super-2 number, since 2×151401521² = 45844841122226882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 151401493 and 151401502.

It is not an unprimeable number, because it can be changed into a prime (151401421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2045930 + ... + 2046003.

It is an arithmetic number, because the mean of its divisors is an integer number (38873373).

Almost surely, 2^151401521 is an apocalyptic number.

It is an amenable number.

151401521 is a deficient number, since it is larger than the sum of its proper divisors (4091971).

151401521 is an equidigital number, since it uses as much as digits as its factorization.

151401521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091970.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 151401521 is about 12304.5325388655. The cubic root of 151401521 is about 532.9789775896.

Adding to 151401521 its reverse (125104151), we get a palindrome (276505672).

It can be divided in two parts, 15140 and 1521, that added together give a palindrome (16661).

The spelling of 151401521 in words is "one hundred fifty-one million, four hundred one thousand, five hundred twenty-one".