1020651651 has 32 divisors (see below), whose sum is σ = 1526553600. Its totient is φ = 673958880.

The previous prime is 1020651649. The next prime is 1020651659. The reversal of 1020651651 is 1561560201.

It is a happy number.

1020651651 is a `hidden beast` number, since 1 + 0 + 2 + 0 + 6 + 5 + 1 + 651 = 666.

It is not a de Polignac number, because 1020651651 - 2¹ = 1020651649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1020651659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1787196 + ... + 1787766.

It is an arithmetic number, because the mean of its divisors is an integer number (47704800).

Almost surely, 2^1020651651 is an apocalyptic number.

1020651651 is a deficient number, since it is larger than the sum of its proper divisors (505901949).

1020651651 is a wasteful number, since it uses less digits than its factorization.

1020651651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1020651651 is about 31947.6392085550. The cubic root of 1020651651 is about 1006.8370321260.

The spelling of 1020651651 in words is "one billion, twenty million, six hundred fifty-one thousand, six hundred fifty-one".