745649121 has 48 divisors (see below), whose sum is σ = 1277887104. Its totient is φ = 383556096.

The previous prime is 745649101. The next prime is 745649141. The reversal of 745649121 is 121946547.

It is an interprime number because it is at equal distance from previous prime (745649101) and next prime (745649141).

It is not a de Polignac number, because 745649121 - 2⁶ = 745649057 is a prime.

It is a super-2 number, since 2×745649121² = 1111985223296145282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 745649121.

It is not an unprimeable number, because it can be changed into a prime (745649101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50991 + ... + 63963.

It is an arithmetic number, because the mean of its divisors is an integer number (26622648).

Almost surely, 2^745649121 is an apocalyptic number.

It is an amenable number.

745649121 is a deficient number, since it is larger than the sum of its proper divisors (532237983).

745649121 is a wasteful number, since it uses less digits than its factorization.

745649121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13030 (or 13023 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 745649121 is about 27306.5765155576. The cubic root of 745649121 is about 906.7999832046.

The spelling of 745649121 in words is "seven hundred forty-five million, six hundred forty-nine thousand, one hundred twenty-one".